Australian and particularly Western Australian (WA) plants have evolved, and are adapted to a wide range of soil types. Some prefer sands while others appreciate clay soils or one rich in organic matter.
If your soil is alkaline or acidic choose plants that prefer those conditions. Many garden centres will do a quick pH test if you take in a soil sample.
If your pH is unsuitable for your desired species, grow them in containers so you can create the right conditions.
Consider also how well your soil drains, whether the site is sunny or shaded for all or part of the day and how exposed to wind it may be.
Find out the history of your block. For example, in a new subdivision that has been built where a market garden once stood, the soil may have high levels of phosphorus, which some Australian plants cannot tolerate. Other areas may carry the risk of diseases such as nematodes to which many natives are susceptible or root rot, including dieback.
Staff members of nurseries or garden centres that specialise in Australian plants will be able to recommend species suitable for your site, including those that tolerate phosphorus.